[1] Wu Liwei, Zheng Yingping, Wang Shaorong, Wang Zhenrong, et al. Oxygen ionic conductivity of a composite electrolyte SDC-LSGMprepared via glycine-nitrate process [J]. Journal of Southeast University (English Edition), 2010, 26 (1): 87-90. [doi:10.3969/j.issn.1003-7985.2010.01018]

Copy

Oxygen ionic conductivity of a composite electrolyte SDC-LSGMprepared via glycine-nitrate process()

Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 1

Page:

87-90

Research Field:

Electrical Engineering

Publishing date:

2010-03-30

Info

Title:

Oxygen ionic conductivity of a composite electrolyte SDC-LSGMprepared via glycine-nitrate process

Author(s):

Wu Liwei¹;  Zheng Yingping¹;  Wang Shaorong²;  Wang Zhenrong²;  Jing Yao¹;  Sun Yueming¹

¹School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
²Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Keywords:

Ce_0.8Sm_0.2O_1.9-δ;  La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ;  composite electrolyte;  oxygen ionic conductivity

PACS:

TM911.47

DOI:

10.3969/j.issn.1003-7985.2010.01018

Abstract:

Ce_0.8Sm_0.2O_1.9-δ-La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ(SDC-LSGM)is prepared by the glycine-nitrate process(GNP).SDC-LSGM composite electrolyte samples with different weight ratios are prepared by the co-combustion method so as to obtain homogeneous nano-sized precursor powders. The X-ray diffraction(XRD)and the scan electron microscope(SEM)are used to investigate the phases and microstructures. The measurements and analyses of oxygen ionic conductivity of SDC-LSGM are carried out through the four-terminal direct current(DC)method and the electrochemical impendence spectroscopy, respectively. The optimum weight ratio of SDC-LSGM is 8〓 ∶2, of which the ionic conductivity is 0.113 S/cm at 800 ℃ and the conductivity activation energy is 0.620 eV. The impendence spectra shows that the grain boundary resistance becomes the main barrier for the ionic conductivity of electrolyte at lower temperatures. The appropriate introduction of LSGM to the electrolyte SDC can not only decrease the electronic conductivity but also improve the conditions of the grain and grain boundary, which is advantageous to cause an increase in oxygen ionic conductivity.

References:

[1] Lin H F, Ding C S, Kazuhisa S, et al. Preparation of SDC electrolyte thin films on dense and porous substrates by modified sol-gel route [J]. Materials Science and Engineering B, 2008, 148(1/2/3): 73-76.
[2] Makiko E, Yan J W, Hiroshige M, et al. High oxide ion conductivity in Fe and Mg doped LaGaO₃ as the electrolyte of solid oxide fuel cells [J].Solid State Ionics, 2006, 177(19/20/21/22/23/24/25): 2053-2057.
[3] Tatsumi I, Junichi T, Shinji I, et al. Recent progress in LaGaO₃ based solid electrolyte for intermediate temperature SOFCs [J]. Solid State Ionics, 2006, 177(19/20/21/22/23/24/25): 1949-1953.
[4] Tatsumi I, Hideaki M, Yusaku T. Doped LaGaO₃ perovskite type oxide as a new oxide ionic conductor [J]. Journal of the American Chemical Society, 1994, 116(9): 3801-3803.
[5] Huang K, Wan Jen-Hau, Goodenough J B. Increasing power density of LSGM-based solid oxide fuel cells using new anode materials [J]. Journal of the Electrochemcial Society, 2001, 148(7): 788-794.
[6] Xu D, Liu X M, Wang D J, et al. Fabrication and characterization of SDC-LSGM composite electrolyte materials in IT-SOFCs [J]. Journal of Alloys and Compounds, 2007, 429(1/2): 292-295.
[7] Ji Y, Liu J, Lü Z, et al. Study on the properties of Al₂O₃-doped(ZrO₂)_0.92(Y₂O₃)_0.08electrolyte [J]. Solid State Ionics, 1999, 126(3/4): 277-283.
[8] Kostogloudis G Ch, Ftikos Ch, Ahmad-Khanlou A, et al. Chemical compatibility of alternative perovskite oxide SOFC cathodes with doped lanthanum gallate solid electrolyte [J]. Solid State Ionics, 2000, 134(1/2): 127-138.
[9] Zhang X G, Satoshi O, Radenka M, et al. Interface reactions in the NiO-SDC-LSGM system [J]. Solid State Ionics, 2000, 133(3/4): 153-160.
[10] Shi M L. AC impedance spectroscopy principles and applications [M]. Beijing: National Defense Industry Press, 2001: 265-281.(in Chinese)
[11] Sha X Q, Lü Z, Huang X Q, et al. Preparation and properties of rare earth co-doped Ce_0.8Sm_0.2-xY_xxO_1.9 electrolyte materials for SOFC [J]. Journal of Alloys and Compounds, 2006, 424(1/2): 315-321.

Memo

Memo:

Biographies: Wu Liwei(1986—), male, graduate; Sun Yueming(corresponding author), male, doctor, professor, ypz_-99@yahoo.com.cn.
Foundation items: The National Basic Research Program of China(973 Program)(No.2007CB936300), the Natural Science Foundation of Jiangsu Province(No.BK2009293).
Citation: Wu Liwei, Zheng Yingping, Wang Shaorong, et al.Oxygen ionic conductivity of a composite electrolyte SDC-LSGM prepared via glycine-nitrate process[J]. Journal of Southeast University(English Edition), 2010, 26(1): 87-90.

Common functions